Welding-furnace.



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APPLIOATION FILED Q.

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WELDING FURNACE.

APPLICATION FILED JAN. 20. 1909.

Patented Oct. 5, 1909.

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WELDING FURNACE.

APPLICATION FILED JAN. 20, 1909.

936,221 1 Patented 001;. 5, 1909.

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"BREWSTER W. CRIBIB, OF BALTIMORE, MARYLAND, ASSIGNOE TO EDWARD W.GREECY, OF WASHINGTON, DISTRICT OF COLUMBIA;

WELDING-FURNACE.

To all whom it may concern:

Be it known that I, BREWSTER IV. CRIBB, a citizen of the United States,residing at Baltimore city, in the State of Maryland, have inventedcertain new and useful Improvements in Velding- Furnaces; and 'I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to welding furnaces, and has for its object toproduce a cheap, simple and efficient portable furnace which can bereadily built around the casting or other body to be welded.

To these ends the invention consists in the novel combinations of partsand details of c;:-nstrnction more fully hereinafter disclosed andparticularly pointed out in the claims.

Referring to the accompanying drawings forming a part of thisspecification in which like numerals refer to like parts in all theviews:Figure 1, is a perspective view of my furnace supported by thebody to be welded; Fig. 2, is a plan view thereof; Fig. 3, a sectionalview of the same on the line 33 of Fig. 2; Fig. 4, a sectional view onthe line 4 a of Fig. 2; and Fig. 5, an elevational view of the wellknown blow pipe flame.

1, represents the walls of the furnace composed of brick or othermaterial preferably temporarily secured together; 2, a metal plate orother support for said furnace; 3, the frame-work or other body to bewelded and from which the plate 2 and walls 1 are supported by thefastening means 4:, which in the instance shown consists of rings shapedto fit the supporting frame 3.

5, represents the mouth of the furnace through which the flame enters;6, a suitable nozzle for delivering a flame thereto; and 7, a combustionchamber.

In Fig. 5, is illustrated the well known blow pipe frame in which 8 isthe dark cone of CO gas; 9, the mantle formed by the oxidation of thisgas to C 10, the luminous tip of the dark cone which is only formed whenthe air supply is deficient, and which when formed constitutes. the wellknown upper reducing zone; 11, the fusing zone which is the hottest partof the flame, and often reaches to a temperature of 2300 (1, and whichlies about mid-way between Specification of Letters Patent.

Application filed. January 20, 1909.

Patented @ct. 5, 1909.

Serial No. 473,279.

close to the outer edge of the mantle 9. Th upper oxidizing flame islocated at 13; and

the lower reducing zone at 14. The burner is provided with means notshown by which the pressure of the jets issuing therefrom may be soadjusted as to cause the dark cone 15 of the flame in the furnace (whichcorresponds to the dark cone 8 in Fig. to be reflected from the inclinedback wall 17 of said furnace; and the fusing and reducing portions ofthe furnace flame corresponding to the parts and 11 of the flame in Fig.5, to play around and in the fracture of the frame or other piece to bewelded. It results from this that oxids are kept out of the fracturewhich is supposed to be located in the frame illustratbd between theparts 18 and 19. In order that the reflected portions of the flame shallplay around all sides of the parts to be welded, the chamber 20 isprovided, which permits the flame to pass up and around two sides of theparts 18 and 19 and to be reflected back on to its upper surface.

The furnace is provided with a suitable peep hole 21 through which theoperations of the flame may be observed, and with opposite holes throughwhich project the parts and 26 of the frame not being heated.

22, represents metal that is placed in the fracture between the parts 18and 19 after said parts have been forced apart by the hydraulic. jack 23in order to open the fracture.

In operation the plate 2 is firmly secured to the body to be welded; thebricks are assembled on said plate and around the fracture so as toproduce the chambers 7 and 20, the reflecting back wall 17 and entrance5; and the bricks as well as the holes in the furnace walls throughwhich project the parts 25 and 26 not to be heated, are luted with clayor some other temporary cementing material, care being taken to soproportion the chambers as to conserve the heat, and as to cause thefusing and reducing zones of the flame to surround the fracture. Somelittle experience and care is necessary to accomplish the best results,because, of course, the dimensions of the furnace and its parts aredependent upon the size of the parts 18 and 19 of the metal body to *beheated; as well as the pressure and supply of fuel that is available inthe burner; but after a few trials success is easily accomplished,especially if the flame is carefully watched through the peep hole 21.

The amount of metal 22 inserted in the fracture is so proportioned as tosupply that portion of metal which is extruded from the fracture, whenthe jack 23 is released and the parts of the frame are permitted toresume their normal position indicated by dotted lines in Fig. 3. Thereducing and fusing flames being permitted to play on the fracture andmetal 22 until the parts are fused together, the jack is released; theparts resume their normal position; the furnace is quickly dismantled,and the metal extruded from. the fracture is hammered down and the jointfinished off.

It will be observed that the foregoing operations may be carried onwithout dismantling more of the machine to which the fractured framebelongs than is necessary to permit this small furnace to be built. Inthe case of fractured locomotive frames, the saving in labor and in timeover the older methods which required the whole locomotive to bedismantled has proved in actual practice to be very great.

Of course, where a propeller shaft or other large body is to be weldedwhile in position the furnace will be correspondingly changed.

IVhat I claim is 1. In a welding furnace, the combination of means tosupport the furnace from the body to be welded; walls supported fromsaid plate provided with holes through which parts of said body project;a combustion chamber; and a second restricted chamber extending aroundfour sides of said body and leading to one side of said combustionchamber, substantially as described.

2. In a welding furnace, the combination of the walls thereof providedwith apertures through which parts of the body to be welded may project;and a plate supporting said -Walls; said furnace also provided withcombustion chamber; a reflecting back wall,- and with a restrictedchamber communicating with said combustion chamber and extending aroundfour sides of the parts to be welded, substantially as described.

3. In a portable welding furnace, the combination of the walls thereofprovided with a peep hole, a mouth and an aperture through which thebody to be welded may project; a plate supporting said walls; and meanssupporting said plate from said body; and said furnace further providedwith a combustion chamber, an inclined back wall from which the productsof combustion may be reflected 011 said body, and with a restrictedchamber communicating with said combustion chamber and extending aroundfour sides of the parts to be welded, substantially as described.

4. A portable welding furnace adapted to be built around the body to bewelded, provided with a mouth; a combustion chamber leading from saidmouth; a reflecting back wall; an aperture through which the body to bewelded may project; and a second restricted chamber extending on foursides of said body, substantially as described.

5. A portable welding furnace adapted to be built around the body to bewelded, provided with a mouth; a combustion chamber leading from saidmouth; an inclined reflecting back wall; a plurality of aperturesthrough which the body to be welded may project; a peep hole; and asecond restricted chamber communicating with, located above, and to oneside of said combustion chamber and extendin on four sides of said body,

substantially is described.

In testimony whereof, I affix my signature,

in presence of two witnesses.

BREIVSTER IV. CRIBB.

Witnesses

